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Method for operating an air-staged diffusion nozzle

A technology of air classification and diffusion nozzles, which is applied in the direction of combustion method, combustion air/combustion-air treatment, engine cooling, etc., and can solve the problem of reducing emissions of gas turbines

Inactive Publication Date: 2012-07-11
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, enhanced mixing of gaseous fuel and air in the combustion tube can result in reduced emissions from the gas turbine

Method used

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  • Method for operating an air-staged diffusion nozzle
  • Method for operating an air-staged diffusion nozzle
  • Method for operating an air-staged diffusion nozzle

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Embodiment Construction

[0020] The following embodiments of the present invention for air staged gas diffusion nozzles for gas turbine combustors have many advantages including enhanced mixing of gaseous fuel and air, thereby reducing gas turbine emissions and also reducing soot formation during start-up. The air staging diffuser nozzle will also draw air from the main air flow path and introduce a swirling air stream at the center of the nozzle tip. Especially with highly reactive fuels, elevated temperatures are observed on the nozzle tip due to the close proximity to the flame. Air introduced into this bypass will cool the nozzle tip so that a film of cool air is formed between the surface of the nozzle tip and the hot gas in the downstream burner tube. The air flow exiting the nozzle tip and the swirling motion imparted to the air flow acts to enhance the mixing of the gaseous fuel with the air. Inventive arrangement for dry low NO with multiple diffusion nozzles X (DLN) burners are desirable a...

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Abstract

The present invention concerns a method for operating an air-staged diffusion nozzle. A method is provided for operating an air-staged diffusion nozzle for a gas turbine combustor to cool the nozzle tip and improve mixing of gas fuel and air within a downstream burner space. Air is mixed with the gas-fuel in an outer swirler and expanded in a downstream burner tube space. Compressed air from a cooling air cavity in the nozzle flows through an inner swirler, passing downstream from the tip of the nozzle to the burner tube space, cooling the nozzle tip and improving the mixing of the gas-fuel with air, thereby reducing emissions from the gas turbine and reducing soot formation in startup. Direction and rotation of the discharged air from the nozzle tip into the burner space may be arranged to promote nozzle tip cooling and gas-fuel mixing with air.

Description

technical field [0001] The present invention relates generally to gas turbines and, more particularly, to air staging diffuser nozzles for gas turbine combustors. Background technique [0002] In a diffuser nozzle for a gas turbine combustor, the fuel begins to mix with the air in the swirl vanes, and then flows and expands in a swirling motion within the burner tube space of the combustor for mixing. In current diffusion nozzles, a low velocity region is observed in the burner tube at the center of the diffusion nozzle. It has been confirmed that there is a high carbon formation on the tip of the diffuser nozzle during start-up and part-load operation. For highly reactive fuels, higher temperatures are observed at the nozzle tip due to the close proximity to the flame. In addition, the enhanced mixing of gaseous fuel and air in the combustion tube can result in reduced emissions from the gas turbine. [0003] Therefore, there is a need for a diffuser nozzle with gaseous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23R3/00
CPCF02C7/04F23R3/00F23R3/28F02C7/12F23R3/04F23R3/14F02C7/18
Inventor A·P·德赛K·卡利斯瓦兰V·波利塞蒂
Owner GENERAL ELECTRIC CO